2020/11/30 by Kilar Zhang, Feng-Li Lin
Physics and Astronomy · #Astrophysical Phenomena and Observations #Black hole (networking) #Compact star #Constraint (computer-aided design) #Dark Matter and Cosmic Phenomena #Dark matter #Gravitational collapse #Gravitational wave #Instability #Neutron star #Pulsars and Gravitational Waves Research #Stars #astro-ph.HE #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.3390/universe6120231
19 pages, 7 figures, for Universe special issue "Neutron Star Astrophysics"; v2: minor revisions, references added, published version
openalex created_date 2020/11/23 · arxiv created 2020/12/04 · openalex publication_date 2020/12/04 · arxiv updated 2020/12/07 · openalex updated_date 2026/08/06
Motivated by the recent discoveries of compact objects from LIGO/Virgo observations, we study the possibility of identifying some of these objects as compact stars made of dark matter called dark stars, or the mix of dark and nuclear matters called hybrid stars. In particular, in GW190814, a new compact object with 2.6 M⊙ is reported. This could be the lightest black hole, the heaviest neutron star, and a dark or hybrid star. In this work, we extend the discussion on the interpretations of the recent LIGO/Virgo events as hybrid stars made of various self-interacting dark matter (SIDM) in the isotropic limit. We pay particular attention to the saddle instability of the hybrid stars which will constrain the possible SIDM models.